Given that
[tex]x=5,[/tex]
you can use the facts that the sum of all the angles must be equal to 360° and that angles opposed by the vertex are congruent. You can set the following equation:
[tex]2(m<1)+9(5)-28+5+12=360.[/tex]
Solving for m<1, you get:
[tex]\begin{gathered} 2(m<1)+34=360, \\ m<1=\frac{360-34}{2}. \end{gathered}[/tex]
Finally, you get:
[tex]m<1=163.[/tex]
Answer:
[tex]163^{\circ}.[/tex]
